/*******************************************************************************
 * File Name          : usb_pwr.c
 * Author             : Brian
 * Date               : 01-Oct-2011
 * Description        : Mass Storage demo main file
 *
 * Original version of this project comes from the STM32 USB FS dev library
 * mass storage example (V3.3.0 21-March-2011). Minor modifications were made 
 * to work with miniSTM32 board.
 */


#include "stm32f10x.h"
 
#include "usb_lib.h"
#include "usb_conf.h"
#include "usb_pwr.h"
#include "hw_config.h"

__IO uint32_t bDeviceState = UNCONNECTED; /* USB device status */
__IO bool fSuspendEnabled = TRUE;  /* true when suspend is possible */

struct
{
	__IO RESUME_STATE eState;
	__IO uint8_t bESOFcnt;
}
ResumeS;

/*******************************************************************************
 * Function Name  : PowerOn
 * Description    :
 * Input          : None.
 * Output         : None.
 * Return         : USB_SUCCESS.
 */
RESULT PowerOn(void)
{
	uint16_t wRegVal;
	
	/*** cable plugged-in ? ***/
	/*while(!CablePluggedIn());*/
	USB_Cable_Config(ENABLE);
	
	/*** CNTR_PWDN = 0 ***/
	wRegVal = CNTR_FRES;
	_SetCNTR(wRegVal);
	
	/*** CNTR_FRES = 0 ***/
	wInterrupt_Mask = 0;
	_SetCNTR(wInterrupt_Mask);
	/*** Clear pending interrupts ***/
	_SetISTR(0);
	/*** Set interrupt mask ***/
	wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM;
	_SetCNTR(wInterrupt_Mask);
  
	return USB_SUCCESS;
}

/*******************************************************************************
 * Function Name  : PowerOff
 * Description    : handles switch-off conditions
 * Input          : None.
 * Output         : None.
 * Return         : USB_SUCCESS.
 */
RESULT PowerOff()
{
	/* disable all interrupts and force USB reset */
	_SetCNTR(CNTR_FRES);
	/* clear interrupt status register */
	_SetISTR(0);
	/* Disable the Pull-Up*/
	USB_Cable_Config(DISABLE);
	/* switch-off device */
	_SetCNTR(CNTR_FRES + CNTR_PDWN);
	/* sw variables reset */
	/* ... */

	return USB_SUCCESS;
}

/*******************************************************************************
 * Function Name  : Suspend
 * Description    : sets suspend mode operating conditions
 * Input          : None.
 * Output         : None.
 * Return         : USB_SUCCESS.
 */
void Suspend(void)
{

	/* suspend preparation */
	/* ... */
  
	uint16_t wCNTR;

	/* macrocell enters suspend mode */
	wCNTR = _GetCNTR();
	wCNTR |= CNTR_FSUSP;
	_SetCNTR(wCNTR);
  
	/* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */
	/* power reduction */
	/* ... on connected devices */

	/* force low-power mode in the macrocell */
	wCNTR = _GetCNTR();
	wCNTR |= CNTR_LPMODE;
	_SetCNTR(wCNTR);

	/* switch-off the clocks */
	/* ... */
	Enter_LowPowerMode();
}

/*******************************************************************************
 * Function Name  : Resume_Init
 * Description    : Handles wake-up restoring normal operations
 * Input          : None.
 * Output         : None.
 * Return         : USB_SUCCESS.
 */
void Resume_Init(void)
{
	/* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */
	/* restart the clocks */
	/* ...  */
	uint16_t wCNTR;
	
	/* CNTR_LPMODE = 0 */
	wCNTR = _GetCNTR();
	wCNTR &= (~CNTR_LPMODE);
	_SetCNTR(wCNTR);
	
	/* restore full power */
	/* ... on connected devices */
	Leave_LowPowerMode();
	
	/* reset FSUSP bit */
	_SetCNTR(IMR_MSK);
	
	/* reverse suspend preparation */
	/* ... */
}

/*******************************************************************************
 * Function Name  : Resume
 * Description    : This is the state machine handling resume operations and
 *                 timing sequence. The control is based on the Resume structure
 *                 variables and on the ESOF interrupt calling this subroutine
 *                 without changing machine state.
 * Input          : a state machine value (RESUME_STATE)
 *                  RESUME_ESOF doesn't change ResumeS.eState allowing
 *                  decrementing of the ESOF counter in different states.
 * Output         : None.
 * Return         : None.
 */
void Resume(RESUME_STATE eResumeSetVal)
{
	uint16_t wCNTR;
	
	if (eResumeSetVal != RESUME_ESOF)
		ResumeS.eState = eResumeSetVal;
	
	switch (ResumeS.eState)
	{
		case RESUME_EXTERNAL:
			Resume_Init();
			ResumeS.eState = RESUME_OFF;
			break;
		case RESUME_INTERNAL:
			Resume_Init();
			ResumeS.eState = RESUME_START;
			break;
		case RESUME_LATER:
			ResumeS.bESOFcnt = 2;
			ResumeS.eState = RESUME_WAIT;
			break;
		case RESUME_WAIT:
			ResumeS.bESOFcnt--;
			if (ResumeS.bESOFcnt == 0)
				ResumeS.eState = RESUME_START;
			break;
		case RESUME_START:
			wCNTR = _GetCNTR();
			wCNTR |= CNTR_RESUME;
			_SetCNTR(wCNTR);
			ResumeS.eState = RESUME_ON;
			ResumeS.bESOFcnt = 10;
			break;
		case RESUME_ON:
			ResumeS.bESOFcnt--;
			if (ResumeS.bESOFcnt == 0)
			{
				wCNTR = _GetCNTR();
				wCNTR &= (~CNTR_RESUME);
				_SetCNTR(wCNTR);
				ResumeS.eState = RESUME_OFF;
			}
			break;
		case RESUME_OFF:
		case RESUME_ESOF:
		default:
			ResumeS.eState = RESUME_OFF;
			break;
	}
}

/**** END OF FILE ****/
